<template>
  <div :class="className" :style="{ height: height, width: width }" />
</template>
<script>
// 按需引入 引入 ECharts 主模块
var echarts = require("echarts/lib/echarts");
export default {
  //   mixins:[chartResize],
  props: {
    className: {
      type: String,
      default: "chart",
    },
    width: {
      type: String,
      default: "100%",
    },
    height: {
      type: String,
      default: "350px",
    },
    // 父组件传递过来的图表数据
    chartData: {
      type: Object,
      required: true,
    },
  },
  data() {
    return {
      // Echarts实例
      chart: null,
    };
  },
  watch: {
    /* 如果图表数据是后台获取的，监听父组件中的数据变化，重新触发Echarts */
    chartData: {
      deep: true,
      handler(val) {
        this.setOptions(val);
      },
    },
  },
  mounted() {
    /* 图表初始化 */
    this.$nextTick(() => {
      this.initChart();
    });
  },
  beforeDestroy() {
    if (!this.chart) {
      return;
    }
    /* 释放图表实例 */
    this.chart.dispose();
    /* dispose 会释放内部占用的一些资源和事件绑定，但是解除实例的引用我们是做不到的，所以需要重新赋值为null */
    this.chart = null;
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el);
      this.setOptions(this.chartData);
    },
    setOptions({ days, data1, data2 } = {}) {
      this.chart.setOption({
        title: {
          text: this.className,
          textStyle: {
            fontSize: 15,
          },
        },
        tooltip: {
          trigger: "axis",
          axisPointer: {
            // 坐标轴指示器，坐标轴触发有效
            type: "shadow", // 默认为直线，可选为：'line' | 'shadow'
          },
        },
        grid: {
          top: 35,
          left: "2%",
          right: "2%",
          bottom: "3%",
          containLabel: true,
        },
        xAxis: [
          {
            type: "category",
            data: days,
            axisTick: {
              alignWithLabel: true,
            },
          },
        ],
        yAxis: [
          {
            type: "value",
            axisTick: {
              show: false,
            },
          },
        ],
        series: [
          {
            name: "数量",
            type: "bar",
            stack: "vistors",
            barWidth: "60%",
            data: data1,
            animationDuration: 2000,
          },
          // {
          //   name: '数量二',
          //   type: 'bar',
          //   stack: 'vistors',
          //   barWidth: '60%',
          //   data: data2,
          //   animationDuration:2000
          // }
        ],
      });
    },
  },
};
</script>

<style>
</style>
